2008—2017年苏州沿江三市主要入江支流水质变化特征
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摘要
采用单因子评价法和Spearman秩相关系数评价法,对2008—2017年苏州沿江三市(张家港、常熟、太仓)主要入江支流水质变化特征进行分析。结果表明,苏州沿江三市的入江支流水质总体好转,张家港市入江支流水质明显好转,太仓市入江支流水质有所好转,常熟市入江支流水质总体保持稳定; NH3-N、COD和BOD5是影响入江支流水质的主要污染指标;主要污染指标优Ⅲ类比例总体呈上升趋势,但2014—2016年有所下降。2017年沿江三市入江支流水质总体处于Ⅲ类水平。
The single factor evaluation method and Spearman correlation method were conducted to analyze the characteristics of water quality changes of 3 cities of Suzhou City( Zhangjiagang,Changshu,Taicang) from 2008 to 2017. The results demonstrated that the water quality of the tributaries of Yangtze River have been improved,among them,Zhangjiagang and Taicang showed significantly improved and slightly improved while Changshu kept stable. While the water quality of the branches of Changshu remained stable. NH_3-N,COD and BOD5 were observed to be the main pollutants during the past ten years. The ratio of pollutants which are better than class III generally showed an upward trend,except for the rebounds during 2014—2016. In 2017,the water quality of the tributaries of Yangtze River was generally at level III.
The single factor evaluation method and Spearman correlation method were conducted to analyze the characteristics of water quality changes of 3 cities of Suzhou City( Zhangjiagang,Changshu,Taicang) from 2008 to 2017. The results demonstrated that the water quality of the tributaries of Yangtze River have been improved,among them,Zhangjiagang and Taicang showed significantly improved and slightly improved while Changshu kept stable. While the water quality of the branches of Changshu remained stable. NH_3-N,COD and BOD5 were observed to be the main pollutants during the past ten years. The ratio of pollutants which are better than class III generally showed an upward trend,except for the rebounds during 2014—2016. In 2017,the water quality of the tributaries of Yangtze River was generally at level III.
引文
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[2]陈进,刘志明.长江20年长江水资源利用现状分析[J].长江科学院院报,2018,35(1):1-4.
[3]孙忠,沈俏会,董萍,等.近十年浙江省地表水环境质量变化趋势及影响因素研究[J].环境监测管理与技术,2018,30(4):23-26.
[4]国家环境保护总局,国家质量监督检验检疫总局.地表水环境质量标准:GB 3838—2002[S].北京:中国环境科学出版社,2002.
[5]罗芳,伍国荣,王冲,等.内梅罗污染指数法和单因子评价法在水质评价中的应用[J].环境与可持续发展,2016,41(5):87-89.
[6]杜永,侯玉婷,唐韧锋,等.神定河口水质变化分析与评价[J].安全与环境工程,2016,23(4):95-98.
[7]荆红卫,张志刚,郭婧.北京北运河水系水质污染特征及污染来源分析[J].中国环境科学,2013,33(2):319-327.
[8]万黎,毛炳启. Spearman秩相关系数的批量计算[J].环境保护科学,2008,34(5):53-55.
[9]史永松.苏州市区河道修复如水质变化趋势及对策研究[J].环境科学与管理,2008,33(6):47-49,52.